Five pound intervals

On my weight loss journey I noticed that my weight came down in five pound intervals. For example when I broke the 235 pound barrier I fluctuated between 230 to 235 pounds until I hit the 230 pound barrier. Then I fluctuated between 225 to 230 pounds. Right now I'm at a solid 220 pounds and fluctuate down to 216 pounds. This time it seems to hang around 220 and not let go. Last time my weight loss was stubborn I helped a friend move which was physically exhausting but it helped me jump down 5 pounds. I may have to increase my exercise program to make the next jump. The fat has got to go.